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Hetaerolite

Hydrohetaerolite is corrected to H₂-bearing variety of Hetaerolite.

Year of discovery: 1877 (Passaic mine (Marshall mine), USA), 1965 (Japan)

Locality list: 5 localities of hetaerolite

• ZnMn₂O₄
• [Zn²⁺][Mn³⁺₂][O₄]^8-

• Class: Spinel subgroup < Oxyspinel group < Spinel supergroup
• Class: Oxide

• Variety: Hydrohetaerolite (+H2O)

• Zn => Mn: Hausmannite

• Mn => Al: Gahnite
• Mn => Fe: Franklinite
• Mn => Cr: Zincochromite

• [] => H₂O: Hydrohetaerolite

• Color: Black
• Streak: Dark brown
• Luster: Sub-Metallic
• Diaphaneity: Opaque

• Cleavage: Indistinct on {001} (1 plane)
• Hardness: 6
• Density: 5.2

• System: Tetragonal
• Group: 4/mmm, I4₁/amd
• Lattice: a=5.7, c=9.2